Like using CineForm, DVCpro100 has the drawback of creating very large files. Correct aspect ratio and correct “timing”. However, my aspect ratio gets screwed up in the preview monitor, it gets interpreted as 4:3 with two huge black bars left and right. When I go via AVI with CineForm in it, things turn out just right. The audio extracted from the MP4 shows that audio and video are too late (nudged to the right). It turned out that the issue arises when I export MP4 from Lightworks. But either way my suspicion is the precise video codec you are using for export from Lightworks may be the issue combined with the precise ffmpeg settings Ardour uses. I could also go through and export straight from Ardour on occasion so long as I told it to always use the original video file. Usually what I tried to do was to make sure my video editing was complete in lightworks, stem export with a HQ video, then import into Ardour and finish audio there, stem export from Ardour, and remux in ffmpeg. It wouldn’t surprise me if the import process for Ardour doesn’t handle specific codecs with timing correctly. I haven’t used Lightworks in a bit, but when I did I did exactly what you are describing with no issue, but I remember I had to spend time finding the correct format to import into and out of Lightworks as it is a bit picky on Linux. If it is starting out of sync my first thought might be that it has to do with the particular video codec you are using to export out of Lightworks. Nah ardour being on the wrong sample rate would cause it to sound lower in pitch, and drift in sync over time, not start out of sync.
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